An extension of a theorem of P. P. Korovkin to singular integrals with not necessarily positive kernels
نویسندگان
چکیده
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ژورنال
عنوان ژورنال: Indagationes Mathematicae (Proceedings)
سال: 1972
ISSN: 1385-7258
DOI: 10.1016/1385-7258(72)90060-1